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1d28efb HTTP: HTTP Negotiate authentication using SSPI
Marcel Roelofs authored
1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at http://curl.haxx.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22 #include "setup.h"
23
24 #ifdef USE_WINDOWS_SSPI
25
26 #ifndef CURL_DISABLE_HTTP
27 /* -- WIN32 approved -- */
28 #include <stdio.h>
29 #include <string.h>
30 #include <stdarg.h>
31 #include <stdlib.h>
32 #include <ctype.h>
33
34 #include "urldata.h"
35 #include "sendf.h"
36 #include "rawstr.h"
37 #include "curl_base64.h"
38 #include "http_negotiate.h"
39 #include "curl_memory.h"
40
41 #define _MPRINTF_REPLACE /* use our functions only */
42 #include <curl/mprintf.h>
43
44 /* The last #include file should be: */
45 #include "memdebug.h"
46
47 static int
48 get_gss_name(struct connectdata *conn, bool proxy, char *server)
49 {
50 struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
51 &conn->data->state.negotiate;
52 const char* service;
53 size_t length;
54
55 /* GSSAPI implementation by Globus (known as GSI) requires the name to be
56 of form "<service>/<fqdn>" instead of <service>@<fqdn> (ie. slash instead
57 of at-sign). Also GSI servers are often identified as 'host' not 'khttp'.
58 Change following lines if you want to use GSI */
59
60 /* IIS uses the <service>@<fqdn> form but uses 'http' as the service name,
61 and SSPI then generates an NTLM token. When using <service>/<fqdn> a
62 Kerberos token is generated. */
63
64 if(neg_ctx->gss)
65 service = "KHTTP";
66 else
67 service = "HTTP";
68
69 length = strlen(service) + 1 + strlen(proxy ? conn->proxy.name :
70 conn->host.name) + 1;
71 if(length + 1 > sizeof(neg_ctx->server_name))
72 return EMSGSIZE;
73
74 snprintf(server, sizeof(neg_ctx->server_name), "%s/%s",
75 service, proxy ? conn->proxy.name : conn->host.name);
76
77 return 0;
78 }
79
80 /* returning zero (0) means success, everything else is treated as "failure"
81 with no care exactly what the failure was */
82 int Curl_input_negotiate(struct connectdata *conn, bool proxy,
83 const char *header)
84 {
85 struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
86 &conn->data->state.negotiate;
87 BYTE *input_token = 0;
88 SecBufferDesc out_buff_desc;
89 SecBuffer out_sec_buff;
90 SecBufferDesc in_buff_desc;
91 SecBuffer in_sec_buff;
92 ULONG context_attributes;
93 TimeStamp lifetime;
94
95 int ret;
96 size_t len = 0, input_token_len = 0;
97 bool gss = FALSE;
98 const char* protocol;
99
100 while(*header && ISSPACE(*header))
101 header++;
102
103 if(checkprefix("GSS-Negotiate", header)) {
104 protocol = "GSS-Negotiate";
105 gss = TRUE;
106 }
107 else if(checkprefix("Negotiate", header)) {
108 protocol = "Negotiate";
109 gss = FALSE;
110 }
111 else
112 return -1;
113
114 if(neg_ctx->context) {
115 if(neg_ctx->gss != gss) {
116 return -1;
117 }
118 }
119 else {
120 neg_ctx->protocol = protocol;
121 neg_ctx->gss = gss;
122 }
123
124 if(neg_ctx->context && neg_ctx->status == SEC_E_OK) {
125 /* We finished succesfully our part of authentication, but server
126 * rejected it (since we're again here). Exit with an error since we
127 * can't invent anything better */
128 Curl_cleanup_negotiate(conn->data);
129 return -1;
130 }
131
132 if(strlen(neg_ctx->server_name) == 0 &&
133 (ret = get_gss_name(conn, proxy, neg_ctx->server_name)))
134 return ret;
135
136 if (!neg_ctx->max_token_length) {
137 PSecPkgInfo SecurityPackage;
138 ret = s_pSecFn->QuerySecurityPackageInfo("Negotiate", &SecurityPackage);
139 if (ret != SEC_E_OK)
140 return -1;
141
142 /* Allocate input and output buffers according to the max token size
143 as indicated by the security package */
144 neg_ctx->max_token_length = SecurityPackage->cbMaxToken;
145 neg_ctx->output_token = (BYTE *)malloc(neg_ctx->max_token_length);
146 s_pSecFn->FreeContextBuffer(SecurityPackage);
147 }
148
149 /* Obtain the input token, if any */
150 header += strlen(neg_ctx->protocol);
151 while(*header && ISSPACE(*header))
152 header++;
153
154 len = strlen(header);
155 if(len > 0) {
156 input_token = malloc(neg_ctx->max_token_length);
157 if(!input_token)
158 return -1;
159
160 input_token_len = Curl_base64_decode(header,
161 (unsigned char **)&input_token);
162 if(input_token_len == 0)
163 return -1;
164 }
165
166 if ( !input_token ) {
167 /* first call in a new negotation, we have to require credentials,
168 and allocate memory for the context */
169
170 neg_ctx->credentials = (CredHandle *)malloc(sizeof(CredHandle));
171 neg_ctx->context = (CtxtHandle *)malloc(sizeof(CtxtHandle));
172
173 if ( !neg_ctx->credentials || !neg_ctx->context)
174 return -1;
175
176 neg_ctx->status =
177 s_pSecFn->AcquireCredentialsHandle(NULL, "Negotiate",
178 SECPKG_CRED_OUTBOUND, NULL, NULL,
179 NULL, NULL, neg_ctx->credentials,
180 &lifetime);
181 if ( neg_ctx->status != SEC_E_OK )
182 return -1;
183 }
184
185 /* prepare the output buffers, and input buffers if present */
186 out_buff_desc.ulVersion = 0;
187 out_buff_desc.cBuffers = 1;
188 out_buff_desc.pBuffers = &out_sec_buff;
189
190 out_sec_buff.cbBuffer = neg_ctx->max_token_length;
191 out_sec_buff.BufferType = SECBUFFER_TOKEN;
192 out_sec_buff.pvBuffer = neg_ctx->output_token;
193
194
195 if (input_token) {
196 in_buff_desc.ulVersion = 0;
197 in_buff_desc.cBuffers = 1;
198 in_buff_desc.pBuffers = &out_sec_buff;
199
200 in_sec_buff.cbBuffer = input_token_len;
201 in_sec_buff.BufferType = SECBUFFER_TOKEN;
202 in_sec_buff.pvBuffer = input_token;
203 }
204
205 neg_ctx->status = s_pSecFn->InitializeSecurityContext(
206 neg_ctx->credentials,
207 input_token ? neg_ctx->context : 0,
208 neg_ctx->server_name,
209 ISC_REQ_CONFIDENTIALITY,
210 0,
211 SECURITY_NATIVE_DREP,
212 input_token ? &in_buff_desc : 0,
213 0,
214 neg_ctx->context,
215 &out_buff_desc,
216 &context_attributes,
217 &lifetime);
218
219 if ( GSS_ERROR(neg_ctx->status) )
220 return -1;
221
222 if ( neg_ctx->status == SEC_I_COMPLETE_NEEDED ||
223 neg_ctx->status == SEC_I_COMPLETE_AND_CONTINUE ) {
224 neg_ctx->status = s_pSecFn->CompleteAuthToken(neg_ctx->context,
225 &out_buff_desc);
226 if ( GSS_ERROR(neg_ctx->status) )
227 return -1;
228 }
229
230 neg_ctx->output_token_length = out_sec_buff.cbBuffer;
231
232 return 0;
233 }
234
235
236 CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy)
237 {
238 struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
239 &conn->data->state.negotiate;
240 char *encoded = NULL;
241 size_t len;
242 char *userp;
243
244 len = Curl_base64_encode(conn->data,
245 neg_ctx->output_token,
246 neg_ctx->output_token_length,
247 &encoded);
248
249 if(len == 0)
250 return CURLE_OUT_OF_MEMORY;
251
252 userp = aprintf("%sAuthorization: %s %s\r\n", proxy ? "Proxy-" : "",
253 neg_ctx->protocol, encoded);
254
255 if(proxy)
256 conn->allocptr.proxyuserpwd = userp;
257 else
258 conn->allocptr.userpwd = userp;
259 free(encoded);
260 Curl_cleanup_negotiate (conn->data);
261 return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
262 }
263
264 static void cleanup(struct negotiatedata *neg_ctx)
265 {
266 if(neg_ctx->context) {
267 s_pSecFn->DeleteSecurityContext(neg_ctx->context);
268 free(neg_ctx->context);
269 neg_ctx->context = 0;
270 }
271
272 if(neg_ctx->credentials) {
273 s_pSecFn->FreeCredentialsHandle(neg_ctx->credentials);
274 free(neg_ctx->credentials);
275 neg_ctx->credentials = 0;
276 }
277
278 if(neg_ctx->output_token) {
279 free(neg_ctx->output_token);
280 neg_ctx->output_token = 0;
281 }
282 }
283
284 void Curl_cleanup_negotiate(struct SessionHandle *data)
285 {
286 cleanup(&data->state.negotiate);
287 cleanup(&data->state.proxyneg);
288 }
289
290
291 #endif
292 #endif
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